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<title>Selection extend() tests</title>
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"use strict";

// Also test a selection with no ranges
testRanges.unshift("[]");

/**
 * We test Selections that go both forwards and backwards here.  In the latter
 * case we need to use extend() to force it to go backwards, which is fair
 * enough, since that's what we're testing.  We test collapsed selections only
 * once.
 */
for (var i = 0; i < testRanges.length; i++) {
	var endpoints = eval(testRanges[i]);
	for (var j = 0; j < testPoints.length; j++) {
		if (endpoints[0] == endpoints[2]
		&& endpoints[1] == endpoints[3]) {
			// Test collapsed selections only once
			test(function() {
				setSelectionForwards(endpoints);
				testExtend(endpoints, eval(testPoints[j]));
			}, "extend() with range " + i + " " + testRanges[i]
			+ " and point " + j + " " + testPoints[j]);
		} else {
			test(function() {
				setSelectionForwards(endpoints);
				testExtend(endpoints, eval(testPoints[j]));
			}, "extend() forwards with range " + i + " " + testRanges[i]
			+ " and point " + j + " " + testPoints[j]);

			test(function() {
				setSelectionBackwards(endpoints);
				testExtend(endpoints, eval(testPoints[j]));
			}, "extend() backwards with range " + i + " " + testRanges[i]
			+ " and point " + j + " " + testPoints[j]);
		}
	}
}

function testExtend(endpoints, target) {
	assert_equals(getSelection().rangeCount, endpoints.length/4,
		"Sanity check: rangeCount must be correct");

	var node = target[0];
	var offset = target[1];

	// "If the context object's range is null, throw an InvalidStateError
	// exception and abort these steps."
	if (getSelection().rangeCount == 0) {
		assert_throws("INVALID_STATE_ERR", function() {
			selection.extend(node, offset);
		}, "extend() when rangeCount is 0 must throw InvalidStateError");
		return;
	}

	assert_equals(getSelection().getRangeAt(0).startContainer, endpoints[0],
		"Sanity check: startContainer must be correct");
	assert_equals(getSelection().getRangeAt(0).startOffset, endpoints[1],
		"Sanity check: startOffset must be correct");
	assert_equals(getSelection().getRangeAt(0).endContainer, endpoints[2],
		"Sanity check: endContainer must be correct");
	assert_equals(getSelection().getRangeAt(0).endOffset, endpoints[3],
		"Sanity check: endOffset must be correct");

	// "Let anchor and focus be the context object's anchor and focus, and let
	// new focus be the boundary point (node, offset)."
	var anchorNode = getSelection().anchorNode;
	var anchorOffset = getSelection().anchorOffset;
	var focusNode = getSelection().focusNode;
	var focusOffset = getSelection().focusOffset;

	// "Let new range be a new range."
	//
	// We'll always be setting either new range's start or its end to new
	// focus, so we'll always throw at some point.  Test that now.
	//
	// From DOM4's "set the start or end of a range": "If node is a doctype,
	// throw an "InvalidNodeTypeError" exception and terminate these steps."
	if (node.nodeType == Node.DOCUMENT_TYPE_NODE) {
		assert_throws("INVALID_NODE_TYPE_ERR", function() {
			selection.extend(node, offset);
		}, "extend() to a doctype must throw InvalidNodeTypeError");
		return;
	}

	// From DOM4's "set the start or end of a range": "If offset is greater
	// than node's length, throw an "IndexSizeError" exception and terminate
	// these steps."
	//
	// FIXME: We should be casting offset to an unsigned int per WebIDL.  Until
	// we do, we need the offset < 0 check too.
	if (offset < 0 || offset > getNodeLength(node)) {
		assert_throws("INDEX_SIZE_ERR", function() {
			selection.extend(node, offset);
		}, "extend() to an offset that's greater than node length (" + getNodeLength(node) + ") must throw IndexSizeError");
		return;
	}

	// Now back to the editing spec.
	var originalRange = getSelection().getRangeAt(0);

	// "If node's root is not the same as the context object's range's root,
	// set new range's start and end to (node, offset)."
	//
	// "Otherwise, if anchor is before or equal to new focus, set new range's
	// start to anchor, then set its end to new focus."
	//
	// "Otherwise, set new range's start to new focus, then set its end to
	// anchor."
	//
	// "Set the context object's range to new range."
	//
	// "If new focus is before anchor, set the context object's direction to
	// backwards. Otherwise, set it to forwards."
	//
	// The upshot of all these is summed up by just testing the anchor and
	// offset.
	getSelection().extend(node, offset);

	if (furthestAncestor(anchorNode) == furthestAncestor(node)) {
		assert_equals(getSelection().anchorNode, anchorNode,
			"anchorNode must not change if the node passed to extend() has the same root as the original range");
		assert_equals(getSelection().anchorOffset, anchorOffset,
			"anchorOffset must not change if the node passed to extend() has the same root as the original range");
	} else {
		assert_equals(getSelection().anchorNode, node,
			"anchorNode must be the node passed to extend() if it has a different root from the original range");
		assert_equals(getSelection().anchorOffset, offset,
			"anchorOffset must be the offset passed to extend() if the node has a different root from the original range");
	}
	assert_equals(getSelection().focusNode, node,
		"focusNode must be the node passed to extend()");
	assert_equals(getSelection().focusOffset, offset,
		"focusOffset must be the offset passed to extend()");
	assert_not_equals(getSelection().getRangeAt(0), originalRange,
		"extend() must replace any existing range with a new one, not mutate the existing one");
}

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